Key points of classification and selection of cryogenic valves - Wuzhong instrument

1. Because the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a frontal scouring on its sealing surface, and the soft sealing belt in the metal sheet interlayer is washed out, which directly affects the sealing performance. Second, by ...

Features of Gate Valve: Light weight: The body is made of high-grade ductile iron, and the weight is about 20%-30% less than that of the traditional gate valve, and the device is easy to repair. Flat-bottomed gate seat: The traditional gate valve is often washed by water and the pipe is due to foreign objects such as stone, wood, cement, iron filings, etc.

　　Selection: The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. The butterfly valve has a simple structure, small size, light weight, only a few parts, and only needs to rotate 90° to quickly open and close, the operation is simple, and the ...

The structure of the thermocouple is to ensure the stable operation of the thermocouple, and the requirements are as follows: The two thermoelectrodes that make up the thermocouple must be strong on the weld to maintain good quality.

The self-operated conditioning valve, also known as the self-operated control valve, relies on the pressure and temperature of the medium flowing through the valve as the energy source, and uses the reaction signal (pressure, pressure difference, temperature) at the output end of the valve to be transmitted to the actuator through the signal tube, and drives the valve disc to change the opening of the valve and reach the conditioning pressure.

1. The corrosion of the valve is usually understood as the damage to the metal material of the valve under the chemical or electrochemical environmental effect. Because the corrosion phenomenon is presented in the spontaneous interaction between the metal and the surrounding environment, therefore, how to isolate the metal from the surrounding environment or more use non-...

Pneumatic butterfly valves are usually composed of a combination of pneumatic actuators and valve bodies and some accessories after debugging. This article first introduces the precautions for the on-site application of pneumatic butterfly valves. 1. The control cabinet sends a signal that the valve does not move, and the pneumatic conditioning butterfly valve is in the device locator after on-site investigation.

Product features of pneumatic conditioning stainless steel butterfly valves: 1. Simple, small size, light weight, small flow resistance, large flow coefficient and good sealing performance. Large conditioning range. It is the fulfillment unit of the instrument in the automatic control system. 2、 ...

For valves in operation, all kinds of valves should be complete and defective. For example, the bolts on the flange and bracket should not be short, and the threads should be free of defects, and no loosening is allowed. The fastening nut on the handwheel, if found to be loose, should be ...

The process of shell experiments and seal experiments done by turbine fixed ball valves in some artificial environments is as follows. Double blocking and discharge function of turbine fixed ball valve: the turbine ball valve is fixed by using tension spring preload float valve seat, when the valve is in two different states, full open and fully closed, the fluid is ...

1) General purpose valve (general purpose valve): a general term for a wide range of valves, also known as ordinary valves. It is not a valve for a specific condition and a specific purpose. Although there is no clear definition of a universal valve, it mainly refers to a pressure below 2MPa, ...

(1) The dispatching valve belongs to the on-site dashboard, and the standard working temperature should be in the field of -25-60 °C, and the air humidity should be ≤ 95%. If it is installed outdoors or in a high-temperature place, moisture-proof and temperature-reducing measures should be used. In areas where there is an epicenter, it is necessary to eradicate the source of vibration or improve vibration isolation measures. ...

(1) The direction of the thermal relay device shall be the same as the specified direction, and the general inclination shall not exceed 5°. If it is installed with other electrical appliances, it should be installed under other electrical appliances as much as possible to avoid the influence of heat generation from other electrical appliances. (2) When wiring the device, check whether the wiring is correct, ...

In all kinds of mechanical connectors, the anti-loosening of bolts is a very important link. So can the tension spring washer be loosened? The principle of anti-loosening of the tension spring washer The anti-loosening principle of the tension spring washer is that after flattening the tension spring washer, the tension spring ...

The commonly used medium for valve pressure test is water, oil, air, steam, nitrogen, etc., and the pressure test methods of various valves are as follows. (1) Globe valve and throttle valve The strength test of globe valve and throttle valve, usually the assembled valve is placed in the pressure test frame, the valve disc is turned over, and the medium is injected to...

1. Pole change speed regulation This speed regulation method is to change the number of stator pole pairs of the cage motor to achieve the speed regulation intention by changing the wiring method of the stator winding, and the characteristics are as follows: it has hard mechanical characteristics and good stability; No slip loss, high power; The wiring is simple, the operation is convenient, and the price is ...

On December 2, 2019, the China-Russia East Route Natural Gas Pipeline Project was officially put into operation. The large-diameter pressure regulator jointly developed and manufactured by Wu Zhong and China Petroleum Pipeline Branch was put into use at Changling Natural Gas Transmission Station in Jilin Province and successfully ventilated. ...

1. Impurities are stuck on the sealing surface of the valve The valve is sometimes closed suddenly, it may be that there are impurities stuck between the sealing surface of the valve, at this time should not be forced to close, the valve should be opened slightly larger, and then try to close, try repeatedly, it can generally be eliminated, otherwise it should be checked again...

The slag lock valve (bucket valve) is specially designed for the complex working conditions of coal gasification, and is a special hard seal ball valve that can adapt to high temperature, high pressure and high wear resistance working conditions. The slag locking valve is mainly used to solve the problem of coal slurry feeding in the gasification unit and the common problem of medium scaling in the valves used in the black water process pipeline.

1. Accounting for traffic The calculation of the flow rate can also be confirmed by referring to the capabilities of fluid handling machinery such as pumps and compressors. Sometimes, a combination of methods is used to confirm. 2. Confirmation of the differential pressure (1) Put the conditioning valve before and after ...